Micrometer lock



' A. SELAS.

MICROMETER LOCK.

APPLiCATlON man AUG.28, 1920.

1 ,402,665, Patented Jan, 3, 1922.

H; Se 1 INVENTOR ATTORNEY Nrrso stares er eerie.

, annxennnns'nras, or r rrrsisnuerr, ENNSYLVANIA. f

MICBOMETER LOCK.

,1 ,eoaees.

specification of Letters Patent. Patgnted Jan, 3, 1922,

' Application and August 28,1920. Serial No. aoeeoa 7 To all whom it may concern:

Be it known that I, ALEXANDER SnLAs, a

citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Micrometer Locks, of which the following is a specification. I

Thi invention relates to locking devices,

and more particularly to means for looking a micrometer in adjustment.

One of the main objects of the invention is to provide simple and. efficient means means whereby the cylinder or stem of the measuring screw of a micrometer may be readily locked against rotation for preserving a measurement taken. A further object 'is to provide a locking device consisting of a minimum of parts and of very simple and efficient construction which may, be readily applied to a micrometer of standard type. Further objects will appear from the detailed description.

In the drawings Figure l is a side view of a micrometer of standard construction with a locking device constructed in accordance with my invention applied.

the locking memis disposed at'right angles to stem or cylinder 4 of the usual measuring screw operated in the Well known manner. A cam member 5 is inserted inslot '8 and is supported by stem or cylinder, this cam member being provided with an extension forming a finger piece 6. By exerting pressure upon piece 6 this cam member may beforced tightly against the inneror upper wall of slot 3 so as to exert great pressure upon stem at. This establishes a frictionlock by means of which rotation of stem 1, and consequently the ada f usting screw, is prevented thus locking the stenrin adjustment and preventing accidental turning thereof. The lockconslsts of but-a single piece which may be readily applied to a m-icrometervof standard type and,

for this reason, may be applied at very small cost and wlthout necessitating any material change in the construction of the m crometer ltself. WhatI claim 1s i In combination with a low micrometer ineluding a rotatable measuring screw stem, the bow of the micrometer being provided with a slot extending across and dlsposed at right angles to said stem, a cam member pivoted on the screw stem and operatlng in said slot, said cam member being adapted by turning to contact wlth the lnner end of the slot so as to. exert pressure upon the screw stem forlocking the same agalnst rotation.

"In testimony whereof I afiix my signature.

' ALEXANDER SELAS. 

